Degree Celsius, °C (unit)

This page documents an OPTIMADE Unit Definition. See https://schemas.optimade.org/ for more information.

ID: https://schemas.optimade.org/defs/v1.2/units/si/1967/named/degcelsius
Definition name: degcelsius

Unit name: Degree Celsius
Latin symbol: degC
Display symbol: °C

Description: A derived SI unit of temperature, defined as degree kelvin offset with +273.15 in 1967 SI units.

"If we add to the practical international Celsius temperatures defined above T₀ = 273.15 degrees, we obtain the practical international Kelvin temperatures. By subtracting T₀ from the thermodynamic temperatures, we obtain the thermodynamic Celsius temperatures." [11th CGPM meeting (1960)]

The degree Celsius was defined and included in SI at the 11th CGPM meeting in 1960, resolution 12 and implicitly redefined via the redefinition of the kelvin at the 13th CGPM Meeting in 1967, resolution 4.

Resources:

Formats: [JSON] [MD]

JSON definition:

{
    "$id": "https://schemas.optimade.org/defs/v1.2/units/si/1967/named/degcelsius",
    "$schema": "https://schemas.optimade.org/meta/v1.2/optimade/physical_unit_definition.json",
    "title": "Degree Celsius",
    "symbol": "degC",
    "display-symbol": "\u00b0C",
    "alternate-symbols": [
        "degcelsius"
    ],
    "description": "A derived SI unit of temperature, defined as degree kelvin offset with +273.15 in 1967 SI units.\n\n\"If we add to the practical international Celsius temperatures defined above T\u2080 = 273.15 degrees, we obtain the practical international Kelvin temperatures. By subtracting T\u2080 from the thermodynamic temperatures, we obtain the thermodynamic Celsius temperatures.\" [11th CGPM meeting (1960)]\n\nThe degree Celsius was defined and included in SI at the 11th CGPM meeting in 1960, resolution 12 and implicitly redefined via the redefinition of the kelvin at the 13th CGPM Meeting in 1967, resolution 4.",
    "resources": [
        {
            "relation": "Redefinition of the kelvin at the 13th CGPM meeting (1967), resolution 4",
            "resource-id": "https://www.bipm.org/en/committees/cg/cgpm/13-1967/resolution-4"
        },
        {
            "relation": "Definition of the kelvin at the 11th CGPM meeting (1960)",
            "resource-id": "https://www.bipm.org/en/committees/cg/cgpm/11-1960"
        },
        {
            "relation": "Wikipedia article describing the unit",
            "resource-id": "https://en.wikipedia.org/wiki/Celsius"
        }
    ],
    "defining-relation": {
        "base-units": [
            {
                "symbol": "degK",
                "id": "https://schemas.optimade.org/defs/v1.2/units/si/1967/base/kelvin"
            }
        ],
        "base-units-expression": "degK",
        "offset": {
            "numerator": 27315,
            "denominator": 100
        }
    },
    "standard": {
        "name": "si",
        "year": 1967,
        "category": "named",
        "symbol": "degC"
    },
    "x-optimade-definition": {
        "label": "degcelsius_si_1967_named",
        "kind": "unit",
        "format": "1.2",
        "version": "1.2.0",
        "name": "degcelsius"
    }
}